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US 10,294,119 B2Granted
Zinc ferrite film and method for manufacturing zinc ferrite film
AssigneesShinko Electric Industries Co., Ltd., Tokyo Institute of Technology
InventorsNobuhiro Matsushita, Yuji Tanaka, Tomoki Kobayashi
Life of this patent
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Abstract
A method for manufacturing a zinc ferrite film includes forming a zinc ferrite film on a base material by having a reaction liquid, which contains metal ions including only bivalent iron ions and bivalent zinc ions, contact an oxidation liquid, which contains an oxidant that oxidizes the metal ions, in the presence of a pH adjuster. The pH adjuster includes a carbonate of ammonium and an alkali metal salt of mono-carboxylic acid.
Claims7
A method for manufacturing a zinc ferrite film, the method comprising:
- forming a zinc ferrite film on a base material by having a reaction liquid, which contains metal ions including only bivalent iron ions and bivalent zinc ions, contact an oxidation liquid, which contains an oxidant that oxidizes the metal ions, in the presence of a pH adjuster;
- wherein the pH adjuster includes a carbonate of ammonium and an alkali metal salt of mono-carboxylic acid.
A zinc ferrite film comprising
- crystal grains observed using an electron backscatter diffraction technique setting a boundary having an orientation difference of 5° or greater as a crystal grain boundary, wherein 50% or greater of the crystal grains observed in a cross-section of the zinc ferrite film extending over a range having a thickness of 1.5 μm and a width of 10 μm are occupied by crystal grains having a grain diameter of less than 0.3 μm, which is expressed by an equivalent diameter.
Dependencies are inferred from the claim text.